marsh



@1.27, 1936- c. w. MARSH Re. 20,145

I 011J sur..

original Filed Feb. 25, 19:53

' Re 20,145A

U'Nlrlzof STATES PATE-Nr `ol-l-lcl-z l 7 ,n sells .Y -omsss'nclmleimnn'slnnukenn. 'ms-lm orlslnsl Ne. 1,911.4. mea Annu zeW.llarshompany,

ofll'iehlgan' mmv ssrlsl No. u41, February z5, less.' Aimliss reissueDecember` z3, lil35, Serial No.

' (ollas- 1) 'he present invention relates to oil seals of the ,typeadapt'edtc be usedabouta shaft to prevent' the leakage of lubricantalong the shaft, but the' present devices are also of generalapplication and 5 maybeutillaedfcl'mllnyctherplll'poees.A l j"ihepresentapplicationisacontinuationin part of my prior application,Serial No. 554,841, med August 3, 1931, now Patent No. 1,901,606,granted March 14, 1933, for Oil seals, and relates particularly to oneof the modications disclosed in said pl lor application, but not coveredthereby.

One of the objects of the invention is theprovisitlllofanimprovedoilsealwhiclllsadapiiedtoA give long continuousservice without necesdty for 16 repair, by virtue of the provision of ameans for automatically compensating for thewear of the parts of the oilseal. K e

Another object of the invention is the provision ci' an improved oilseal adapted tojeliminate any 20 possibility of metallic parts of theseal wearing throught-he packing or otherwise coming incontact withthelnoving shaft.

Another object of the invention is the provision of an improved oil sealpeculiarly adapted to with- 25 stand considerable wear and usage andadapted to automatically take up the wear and compensateforthesamethroughout along life ofservice.`

'Another object ofthe invention is theprov'ision of an improved'oii sealin which the packing may be removed and conveniently replaced, therebyfacilitating the maintenance vori the seal in the best condition at alltimes.

Another obiect oi' the invention is the provision of ani improvedoilseal which may he cheaply manufactllred and installed by virtue ofthefact that most of the parte of the seal lend themselves` readily tomanufacture by 'stamping operations. Another object of the invention isthe provision of a plurality of moditlcationsof my improved oil 40 seal;each one of which has advantages which are theresult oftheparticularconstruction ofsuch `Othlel' objects and advantages oftheinvention will be yapparent from the following description and from theaccompanying drawing.- in which similar characters of referenceindicateparts of the several views. y Referring to the single sheet ofdrawing accompanying this description,

Flg. l is'a fragmentary sectional view take:lyona'pianepassingthroughtheaxisof theshait,l

showing the shaft in elevation and the details oftlleoilsealanditllinodeofinstallationirlcross*v ss rig. 2 ls e sunllsrrmmentsfyy'lew. e;

modiilcation employing a pressed metal sheet as an expanding ring; Pig.3 is an enlarged sectionalview ofone of the V-shaped packings andexpanding showingindottedlinesthemodeotcf 5 the packings into edgewiseent vvithvtheI e .Referring'to Fig. 1, Il indicates th'eframe or casingVof amachine upon which the present oil seal is used. swch as'.Y .forexample, an electric l0 motor having a shaft Il'whlch is rotatablymounted upon the ball bearings i2 located in the 'races I3 and Il.Theracell isfi'xedlysecuredin thebore Il of theirame llandthe numeral Ilindicates one of sealsinits en- 1.6

mineluszsustlsnwmehnssbeenseleedmm illustrate the invention. only one'su sesl n is employed. but it should be understood that 1ismerelyafragmentary'viewandsimilaroilseals ,uy

may he usedvupon both sides of the anti-friction bearings fcr conilnlnglubricant about the bearlngs, end the lubrlenntlnsy be supplied by peep'ing the bearings during installation or bythe-use of standard highpressure ilttill'gs.l The installag5' tion shown is merely-exemplary ofone of the manymodes oi' use otmy improved oil seals.V

` The oilseal It is preferably provided with .a casing Il, preferablystamped-out of sheet metal such -as steel', and formed with asubstantially so Y.

cylindrical flange Il and a radiallyextending" ilange I. The Vradiallyextending flame Il is provided with an aperture Il which is dennitely-largerthantheslzeofshaftlh'andthecasing'llispreferablyfixedlyaecuredintheborellinsuch-ss,aml'tllnel'thattheedgeroftlleilangeilcrarly' f Aothermetallicpartsoi'theoilseal'cannot come .incontactwiththeshaftll part preferablyground :e at ln me here Il, fel-mins 46" aliquidilghtjoint,andthecasingIlisprsed l into close frictional twiththewalls ofthebore Ilintheelnbcdimentiof ll'ig. i.

Theoilsealispreferably providedwithapack`ingofthetypeillustraieithepaeklngllconslst- Il of a closed moldedleather ring of substantially-V mi in cross section;

The molded packing 2l may', in someemhodiments. consist of a pluralityof-gspiral turns cf v-shaped packing. or in somecasea a urlllltiplie.T50 ity of ringsmaybeused,'eachringnestingin the other and forming amember oi' substantially.. the same shape as Il. but i of a plurality ofseparate layers.

suene: 'me peexlnsrlnus n ls provided mi cientlyA flexible tobe forcedinto closer engagement with the shaft lilby any pressure which may existinsidethe packing 2 By virtue of the construction and arrangement of thepacking 23 and a pair of expansion members 36, 31, the packing 23 ispeculiarly adapted linterior of the casing Il and the external surfaceofshaftI Il.

Referring to Fig. 3, this-is an illustration of the section of theexpansion members on the expansible V-'shaped packing 23. The spring 1.0forces the internal expansion member 33 against the packing at thepoints 33 and 39, forcing the lips 34 and 35 outward and forcing theflanges 29 and 3|!V outward into engagement with the .inner wall of thecasing surface and the shaft Il.

The external expansion memberA 36 holds. the apex of the packing againstaxial movement. The leather packing 2l is thus fed edgewlse a intoengagement with the shaft i I, and as fast engages the apex as the edgeof thepacking wears oif a new surface is presented and the spring 10 andexpansion members keep the leather packing 23 in continuous oil tightengagement with the shaft Il.

Referring to Fig. 3, the dotted line position of the packing ing actionof the expansion members on the V- shaped packing. 'I'his feeding actioncontinues as long as the flanges 29 and 33 of the leather packing arewider than the space within which they are forced by the expansionmembers and the present oil seal is therefore adapted to compensate forwear and continuously maintain an oil tight or liquid tight Joint aboutthe shaft Il. Referring to Fig. 2, the inner expansion membermay` bemade of sheet metal and pressed to'V the lar engaging the inside of thepacking.

- lThe expansion member 21 preferably comprisesastampedsheetmetalmemberhav'inganannular concave surface which is ofless angularity shape shown, being provided with an annu.-

than the external suriace "of the packing 23:

that is, the curved annular surface a initially 3| of the packing 2l andtends expandl the packing. The expansion member in the embodiment ofFigs. l and' 2 is formed -by theradially extending flange il, which is apart ofthe casingof the oil seal.

In the embodiment of Pigs. 1 and 2 the parts be fed edgewlse intoengagement with the flange 43 of substantially tubular shape for thespring chamber Il.' and the spring 'Il is tensioned against thefmsto-conical surface Il.

The operation of this oil seal is as follows: The tension of the garterspring 'il tends to cause the contraction of the spring 13 into the V-shaped opening between thefrusto-conicai surfaces Il, I5. Spring 1I thustends to cam the surfaces apart and urges the inner expansion memberdownward, in Figs.v1 and 2, against the flanges of the leather V-shapedpacking. 'I'he leather packing is thus continuously expanded and fededgewise into engagement with the shaft Il, and the wear of the leatherpacking is thus continuously taken up and an oil and water tight jointis constantly maintained about the shaft Il.

This oil seal also preferably has its outer surface ground to fit in thebore about the shaft. and while the packing is not renewable withouttaking the oil seal apart, the amount of expansion attained by thispacking and its expanderl is such that the oil seal is capable ofperforming its functions for substantially the full life of themachinery upon which it is used.

'I'he present oil seals are capable of giving long' service withoutnecessity for replacement or repair and the leather packing isautomatically fed into place edgewlse to continuously present a newsurface and maintain an oil tight contact with the moving shaft.

The sharp lips on the packing maintain a betl ter seal than packings ofother shape, for the 23 is an illustration of the feedscope of theappended claims.

Having thus described my invention, Vwhat I claim as new and desire tolecureby'United States Letters Patent is: i

'1. InanoilseaLacasingcomprisingastamped sheet metal member formed witha cylindrical outer wall and with an'end wall having a centrally locatedbore and an annular ridge located.

midwaybetween theouterwallandtheedgeof said bore, an end platecomprising a metal member formed with a centralb located bore. saidmember being circular in shape and frictionally secured invsaid outerwall, the outer wall being spun over outside of said end plate. and saidend plate having an ent withsaid 2. lnanoilseahacasingcomprisingastampedinwardly extended frusto-coni-- -caliiangeadjacentsaidcentrallylocatedbore. a

, sans securedinsaidouter-walhtheouter'wall spun over"l outside of saidend plate and said end plate having an inwardly extending frusta-conicaliiange adjacent said centrally located bore.

' 5 apackinginsaidcasingandanexpansionmember for said packing and havinga frusta-conical surface extending to' said frusta-conical iiange'. saidexpansion memslidabLv mounted in saidicasing and i0 having a centrally'located bore. and tension meansf engaging said frusta-conical surfaceand frusta-conical flange to force said expansion /member intoengagementwith said said expansion member .being formed with an angularridge located' midway Vbetween its outer edge and theedg'eofthecentrallylocatedbore, said pack- .`ing comprising a il-shapedradially expansible having two truste-'conical iianges joined alongtbejline of a circle and engaging the end of the' only atgthe apex ofsaid flanges, said packing being engaged by said expansion memberadiacent the inner and outer edges of said packingy whereby axialmovement of said expansion membertends to causesaid packing to become"wider and expand by virtue of -the decrease in l angular-ity of itstruste-conical flanges.

f 3. 'In an oil seal,`a casing comprising a sheet metal member formed'with a cylindrical outer wall and with an end wall having acentrallylocated bore, an end plate comprising a metal member formed with acentrally located bore. said member being circular in shape and securedto said outer wall, one of the ends of said casing having an inwardlyextending frustoconical angey adjacent said centrally located bore. apacking in said casing and an expansion member for engaging saidpacking, and having a irustoconical surface extending transversely to.said frusta-conical flange, said expansion member being slidablymounted in said casing and having a' centrally located bore. and`tension 4rnear'is engaging said frusta-conical surface and..frusto-conical ange to force said expansion member into engagement withsaid packing.

`a packing in said and an expansion member "fo'rsaid' packing, andhaving a frusto-conical surface extending transversely to saidfrusta-conical ilange, said expansion member being slidablymounted insaid casing and having a 'centralLv bore and tension means engagingvsaid truste-conical surface and frusto-conleal ange to force saidexpansion member mtcengngement with said packing, said cylindrical wallof said casing being spun over theedgeofs'aidend platetosecurethelatterin place. Y

.5.111 an oil seal, the combination of a metal housing having acylindrical outer wall and hav- Y ing an/inwardlv extending end wall,said end virali having a centrally located bore for passing a. shaft orthelike, said housing having atits opposite ,end an. end plate ofsubstantially "circular forni adapted to be received inside saidcylindrical wall.I said end plate having a centrally l' Aliicatetlborefor a shaft, a packing in u said said packing being substantially t '4.InanoilseaLacasingcomprisingastamped! an end wallhavinga cen- V-sbapedin section and comprising a pair of substantially frusto-conical Joinedat an apex along th'e line of a circle, and the apex of the packingengaging one of the ends of said housing, an expansion member adapted toengage the outer-andv inner edges of the opposite end of the expansionmember being slidf, gbly mounted in said cylindrical wall and beingformed with diagonally inwardly extending surface, the other end of saidhousing being formed with a similar but oppositely diagonally inwardlyextending surface forming an angular groove between the end of saidhousing and said expansion member, and contractible resilientmeanslovcated in said groove for forcing the expansible member away from theadjacenty end of said housing to expand said packing.

6. In an oil seal. the combination of a metal housing having acylindrical outer wall and having an inwardly extending end wall, saidend wall having a centrally located bore for a shaft or thelike. saidhousing having at its opposite end an end plate of substantiallycircular' form adapted to be received inside said cylindricalwall. saiden d plate having a. centrally Jocated bore for a shaft, a packing insaid housing, said packing being substantially vshaped in cross sectionand comprisinga pair of i substantially truste-conical iianges Joined atan apex along the line of a. circle, the apex of the king one of theendsofsaid housing, an expansion member adapted to engage the vouter andinner edges of the opposite end of the packing. said expansion memberbeing slidably mounted in said cylindrical wall and being formed with adiagonaliyvinwardly extending surface, the other end of said housingbeing formed with'a similar but oppositely diagonally inwardly extendingsurface forming an angular groovev between the end of said housing andsaid expansionmember, and contractible resilient means located. in saidgroove for forcing the expansible member awayi'rb'm the adjacent' end ofsaid housing to expand said packing, said contractible resilient meanscomprising a helical garterspring.

.7. In an oil seal. a housing comprising a stamped sheet metal memberformed with an outer wall and with anvend wall having acentrallylocatedboreforashaft,anend plate-comprising a metal memberformed with a centrally located bore aligned with the ilrst mentionedbore for passing said shaft, said end plate being circular in shape andsecured to said outer wall, forming a casing with two apertured ends,one of the ends of said casing having an inwardly extending tapered angeadjacent said centrallyk located bore, a `pacliing in said casing.

and anexpansion member for engaging said vpacking,said expansion memberhaving a tapered surface surrounding a centrally located bore, thetaperedl .surface extending transversely to the l' tapered surface 'atone en d of said casing. said expansion member being slidably mounted insaid casing, and tension means engaging said tapered surface to forcesaid expansion member into engagement with said packing.

8. In an oil seal, -a housing comprising a stamped sheet metal memberformed with an outer wall and with'an end wall having a centrallylocated bore for passing a shaft, an end plate comprising a metal`member formed with a centrally located bore aligned with the iirstmentioned bore for passing said shaft, said endplatebeingcircularinshapeandsecuredtosaid said packing comprising outerwall. forming a casing with two apertured ends, one of the ends of saidcasing having an inwardly extending tapered ange adjacent said centrallylocated bore, a packing in said casing. and an expansion member forengaging said packing, said expansion member having a tapered surfacesurrounding a centrally located bore. the tapered surface extendingtransversely to vthe tapered surface at one end oi' said casing, saidexpansion member being siidably mounted in said casing, and tensionmeans engaging said tapered surface to force said expansion member intoengagement with said packing. a molded leather ring having a pair offrusta-conical flanges joined together along the line of a circle andhaving beveled edges for engaging `the shaft and engaging the outer'wallof said housing.

9. In' an oil seal.. a housing comprising a stamped sheet metal memberformed with an outer wall and with an end wall having a centrallylocated bore for passinga shaft, an end plate comprising a metal memberformed with a centrally located bore aligned with the first mentionedbore for passing said shaft, said end platebeingcircularinshapeandsecuredtosaid "outer-wall, forming a casing with two apertured ends,one of the ends of inwardly extending tapered flange adjacent saidcentrally located bore. a packing lin said casing. and an expansionmember for engaging said packing, said expansion member having a taperedsurface surrounding a centrally located bore. the tapered surfaceextending transversely. to the tapered surface at one end of saidcasing. said expansion member said casing, and tension means engagingsaid tapered surface to force said expansion member into engagement withsaid packing, said packing comprising a molded leather ring having apair of frusta-conical flanges joined together along the line of thecircle and having beveled edges for a shaft and engaging the outer wallof said housing and said packing being engaged by said expansion-memberand one of the ends of said housing, the engagement on one side of 4thepacking being at the inner side of the flanges adjacent the beveled edgeand on the other side of the packing being at the apex of said flanges.CHARLES W. MARSH.

being slidably mounted in.

said casing having an.

